Two Chains of Rhamnogalacturonan II Are Cross-Linked by Borate-Diol Ester Bonds in Higher Plant Cell Walls |
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| Authors: | Kobayashi M. Matoh T. Azuma Ji. |
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| Affiliation: | Plant Nutrition Laboratory, Department of Agricultural Chemistry (M.K., T.M.), and Laboratory of Recycle System of Biomass, Department of Bio-environmental Science (J.-i.A.), Faculty of Agriculture, Kyoto University, Kyoto, 606-01, Japan. |
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| Abstract: | Polysaccharide moiety of the boron-polysaccharide complex (T. Matoh, K. Ishigaki, K. Ohno, J. Azuma [1993] Plant Cell Physiol 34: 639-642) isolated from radish (Raphanus sativus) roots has been shown to be rhamnogalacturonan II by glycosyl-linkage analysis and the presence of diagnostic monosaccharides, including apiose, aceric acid, 2-O-methylfucose, and 3-deoxy-D-manno-2-octulosonic acid. Removal of boron from the complex reduced the molecular weight by one-half without causing a significant increase in the number of reducing end groups, indicating that boron, as boric acid, links two rhamnogalacturonan II chains together to form the boron-polysaccharide complex. |
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